Peter P. Chen Reind P. van de Riet Introduction to the Special Issue Celebrating the 25th Volume of Data & Knowledge Engineering: DKE. 1-9 1998 25 Data Knowl. Eng. 1-2 db/journals/dke/dke25.html#ChenR98 http://dx.doi.org/10.1016/S0169-023X(97)00059-1